Free Profit Margin Calculator for Australian Business for Tradies
Work out the real margin on every job, materials and labour included, with GST handled correctly, so your quotes actually leave you with profit after the work is done.
Last updated 31 May 2026
This profit margin calculator is built for Australian tradies and construction businesses who need to know the true margin on a job before they quote it. Sparkies, plumbers, builders, landscapers and concreters all face the same trap: the materials markup looks healthy, but once labour, super and overheads are loaded in, the job barely breaks even. Enter your quoted price and your direct cost, choose whether the figures include or exclude GST, and the tool shows gross profit, margin, markup and cost ratio instantly. It keeps materials and labour on a consistent GST basis so the margin you see is the margin you keep after you remit GST on your BAS. Use it on the ute before you send a quote, or in the office when a supplier hikes timber, copper or steel prices and you need to know how much to lift your rates to protect your margin.
How to use this tool
- 1
Enter revenue and cost of goods
Type in your selling price (revenue) and the direct cost of the goods or materials. Keep both on the same basis, either both ex-GST or both GST-inclusive, and the calculator will reconcile them based on the GST option you pick next.
- 2
Choose your GST treatment
Select whether your figures exclude GST or include 10% GST. If your numbers come straight off a tax invoice they usually include GST, so pick that option and the calculator removes the GST before working out margin.
- 3
Read your margin, markup and cost ratio
Instantly see gross profit in dollars, gross profit margin as a percentage, your markup, and cost as a percentage of revenue. Email the result to yourself or your accountant to keep alongside your pricing notes.
Margin versus markup: the difference that costs you money
Margin and markup are not the same number, and confusing them is one of the most common pricing errors in Australian small business. Markup is profit as a percentage of cost. Margin is profit as a percentage of the selling price. If something costs you $100 and you sell it for $150, your markup is 50%, but your margin is only 33%, because the $50 profit is one third of the $150 you charged. The gap widens as the numbers climb, which is why pricing off markup while thinking in margin terms quietly erodes profit. A worked rule helps: to convert a target margin into the markup you need, divide the margin by one minus the margin. A 40% target margin requires a 67% markup on cost. This calculator shows both figures side by side so you never have to guess which one you are looking at. Why it matters in practice: suppliers and trade accounts usually quote you a markup, while accountants, lenders and the ATO think in margin. When you set a price, decide your target margin first, because that is the share of every sale you actually keep, then work backwards to the markup you apply at the counter or on the quote. Getting this right on every line is the difference between a business that looks busy and one that is genuinely profitable. Run a few of your own products through the tool and you will quickly see where your markup habits have been leaving margin on the table.
GST and the 10% trap when you calculate margin
If your business is registered for GST, the 10% you charge customers is not yours to keep. You collect it for the ATO and remit it on your BAS, so it must never be counted as revenue or profit. The classic error is pricing GST-inclusive but costing GST-exclusive, or the reverse, which inflates or understates your real margin. Say you sell an item for $1,100. That is $1,000 of revenue plus $100 of GST. Your margin should be worked out on the $1,000, not the $1,100. To strip GST from a GST-inclusive figure, divide by 1.1. To add GST to an ex-GST figure, multiply by 1.1. This calculator does that automatically once you pick your GST treatment, so both sides of the sum stay consistent. A few practical notes for Australian businesses: if your turnover is $75,000 or more you must register for GST, and once registered you can claim GST credits on the cost of the goods you buy, which means your true cost is the GST-exclusive amount. If you are not registered for GST, your figures are simply GST-free and you compare the actual dollars paid and received. Either way, always calculate margin on a consistent GST basis. We recommend working in ex-GST numbers for all internal pricing and margin decisions, then adding GST only at the final invoice stage. That habit keeps your margin maths clean and your BAS reconciliation straightforward at the end of each quarter.
Why gross margin is not the whole picture
Gross profit margin only looks at revenue minus the direct cost of goods sold. It is the right starting point, but it ignores the overheads that decide whether you actually take home a profit. In an Australian business those overheads usually include wages, superannuation at 11.5% on top of ordinary earnings, rent, insurance, equipment, software subscriptions, vehicle costs and your own time. A product line can show a healthy 40% gross margin and still lose money once you load in the labour and overhead to deliver it. To get from gross margin to net margin, subtract all operating expenses from gross profit and divide by revenue. A useful benchmark is that gross margin needs to comfortably cover your overhead percentage with room left over, otherwise you are working hard for nothing. Use this calculator for the gross figure first, then build a simple overhead allocation on top. Watch your gross margin trend over time rather than a single snapshot, because a slow slide of even two or three percentage points across a financial year can wipe out your net profit. Review it whenever a supplier raises prices, when wage costs change under a Fair Work award increase, or when you discount to win volume. The businesses that stay profitable are the ones that recheck margin on every quote and every price list, not once a year at tax time.
From manual margin checks to automated pricing
Running numbers through a calculator one item at a time is fine for a quick check, but most Australian businesses are doing it across dozens of products, jobs or quotes every week, and that is where it stops being a quick check and starts being a job in itself. Every time a supplier sends a price increase, someone has to find the affected items, recalculate the margin, decide on a new price, and update the system before the next quote goes out. Done by hand in spreadsheets, it is slow and it is exactly where errors creep in. The same applies to GST handling, margin reporting, and flagging products that have quietly dropped below your target margin. This is the kind of repetitive, rules-based work that automation handles well. At Clever Ops we build systems for AU mid-market businesses that pull cost and price data from your accounting or point-of-sale software, apply your margin rules automatically, flag underperforming lines, and keep pricing current as costs move, so your team stops recalculating and starts acting on the numbers. If you find yourself doing the same margin maths over and over, that is a signal it could be automated. Book a free assessment and we will show you where the time is going.
Margin on a trade job: materials, labour and the bits that get missed
Most tradies price the materials with a comfortable markup and then add labour at an hourly rate, but the margin trap hides in the labour and the overheads. Your charge-out rate has to cover the wage, superannuation at 11.5%, workers comp, leave, vehicle and tool costs, insurance and the time spent quoting jobs you do not win. A common rule of thumb is that the cost of an apprentice or tradie to the business is well above the wage you pay them once on-costs are added, so the gap between charge-out rate and true labour cost is your real labour margin, not the headline rate. Run materials and labour through the calculator separately, then combined, to see which part of the job is carrying the profit. Watch for the classic killers: variations done as a favour and never invoiced, materials bought retail because the job ran short, travel time between sites, and rework. Each one chews into the margin you priced. With supplier prices moving constantly, recheck your margin whenever a major material jumps, and lift quotes accordingly rather than absorbing the increase. The other discipline that protects trade margin is invoicing fast and chasing payment, because a 20% margin means nothing if the customer never pays. If you are quoting several jobs a week and recalculating margin by hand each time, that is repetitive work a system can do from your job-management or accounting software, freeing you to be on the tools.
Worked example
A GST-registered Australian retailer wants to check the margin on a product it sells for $1,100 including GST, which costs $550 including GST to buy in from the supplier.
- Revenue (selling price)
- $1,100
- Cost of goods
- $550
- GST treatment
- Figures include 10% GST
- Ex-GST revenue (1,100 / 1.1)
- $1,000
- Ex-GST cost (550 / 1.1)
- $500
Gross profit: $500. Gross profit margin: 50%. Markup: 100%. Cost as % of revenue: 50%.
Because both figures included GST, the calculator strips the 10% from each before working out margin, giving $1,000 revenue and $500 cost ex-GST. The $500 gross profit is a 50% margin on the selling price but a 100% markup on cost, a clear illustration of why the two numbers must never be confused. Had margin been calculated on the GST-inclusive $1,100, it would have looked higher than it really is, and that overstated profit would vanish at BAS time when the GST is remitted to the ATO.
Who uses this tool
Electricians and plumbers
Before quoting a fit-out, you check the combined margin on materials and labour. The copper or cable price has jumped, so you see exactly how much to lift the quote to hold your target margin rather than wearing the increase.
Builders and renovators
On a fixed-price renovation you run the margin on each trade and the materials package, confirming the job clears your minimum margin once site overheads, super and supervision time are accounted for, before you commit to the contract price.
Landscapers and concreters
A client wants a discount to win the job. You use the calculator to see how far you can drop the price before the margin no longer covers labour, plant hire and GST, so you negotiate from real numbers instead of a gut feel.
Frequently asked questions
Should I include GST when calculating profit margin?
No. If you are registered for GST, the 10% you charge belongs to the ATO, not your business, so margin should be worked out on the GST-exclusive figures. This calculator lets you enter GST-inclusive numbers and strips the GST out automatically. We recommend doing all internal pricing in ex-GST dollars and adding GST only at the final invoice stage to keep your margin maths consistent.
What is the difference between margin and markup?
Markup is profit as a percentage of cost, while margin is profit as a percentage of the selling price. An item costing $100 sold for $150 has a 50% markup but only a 33% margin, because the $50 profit is one third of the $150 price. They diverge more as numbers grow, so this calculator shows both side by side to stop the two being confused when you set prices.
How do I calculate gross profit margin?
Gross profit margin is gross profit divided by revenue, expressed as a percentage. First subtract the cost of goods sold from your revenue to get gross profit, then divide by revenue. For example, $1,000 revenue minus $600 cost equals $400 gross profit, and $400 divided by $1,000 gives a 40% gross margin. Use ex-GST figures on both sides for an accurate result.
What is a good profit margin for an Australian business?
It varies widely by industry. Retail and hospitality often run lower gross margins on high volume, while service and trade businesses can target higher gross margins to cover labour and overheads. There is no single right number, but your gross margin must comfortably cover all operating costs including wages, super at 11.5%, rent and insurance, with profit left over. Benchmark against your own trend rather than a generic figure.
Does this calculator account for overheads and net profit?
No, it calculates gross profit margin, which is revenue minus the direct cost of goods sold. It does not include overheads such as wages, rent, insurance or software, so it does not show net profit. Use the gross figure as your starting point, then subtract all operating expenses to work out net margin. Gross margin needs to be high enough to cover those overheads and still leave a profit.
Is this profit margin calculator free to use?
Yes, it is completely free and there is no sign-up required to run a calculation. Enter your revenue, cost and GST treatment, and you get gross profit, margin, markup and cost ratio instantly. You can optionally enter your email to have the result sent to you or your bookkeeper for your records. We built it as a practical tool for Australian owners who need quick, accurate pricing answers.